I was getting tired of all the bickering in this thread and decided to take action instead: I took @f1rpo's Pyrrhic Victories mod and merged it with 1.15. Download the attached archive and let it overwrite DoC. I can't vouch for whether or not this works for the development version too, I only tested it with the release version. Literally the only thing this mod changes is that units that would die in a >90% odds fight retreat instead and survive with a sliver of health left just as if they had withdrawn. (Oh and I guess there's some ramifications for XP and war weariness or something.) The exact survival threshold can be changed in GlobalDefinesAlt.xml. Also included in the archive is a manual that explains in detail how everything works. Credit for the original mod goes to @f1rpo.